Book  (2008)  Page(s) 20.  
 
"I used seedlings from open pollinations of four of [Simonet's] hybrids. One of these was 'Masquerade' x pink laxa. I wasn't sure about the pink laxa. My questioning look was answered by a French shrug! One seedling derived from open pollination of this cross was D14 which was the parent of 'John Cabot'."

Book  (2008)  Page(s) 41.  
 
Graph 4 Parent Roses derived from Robert Simonet's Hybrids...
Simonet S42 = Masquerade X presumably R. laxa Retzius